When querying the following endpoint and parameters: https://goerli.api.0x.org/swap/v1/quote?buyToken=0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee&sellAmount=1000000000000&sellToken=0x88D96a012a71f053041fe2BF27bC4703cebBB7b2

I get error like this:

    "code": 100,
    "reason": "Validation Failed",
    "validationErrors": [
            "field": "zippo",
            "code": 1010,
            "reason": "ZIPPO_CONTEXT_INVALID",
            "description": "Invalid zippo context"

This endpoint is that I used before with the same params and it had worked well before. just I got the error from yesterday. I tested Mumbai endpoint too but it also returns the same error now.

Any help in understanding what is causing the issue would be helpful.

  • Same issue here. It worked yesterday but today (same code) it started giving this weird error. Maybe it's a Goerli endpoint issue?
    – Neurus
    Commented Aug 17, 2023 at 6:38
  • Same issue, suddenly stopped working on testnets. Commented Aug 17, 2023 at 12:54

1 Answer 1


0x team here. The ZIPPO error on goerli has been fixed! Thank you for your patience

Remember to use your API key in the header. Ex:

curl --location --request GET 'https://goerli.api.0x.org/swap/v1/quote?buyToken=0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee&sellAmount=1000000000000&sellToken=0x88D96a012a71f053041fe2BF27bC4703cebBB7b2' --header '0x-api-key: <insert-your-key>'
  • Thanks for fix. How about mumbai? I got the same error on mumbai as well. goerli api looks work well actually.
    – Luckydev
    Commented Aug 19, 2023 at 7:13
  • As of 8/22, Mumbai should be fixed now as well
    – 0x_jess
    Commented Aug 24, 2023 at 19:30

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